I don’t have a good quantitative test for finishing or sharpening and I have not yet performed any edge retention experiments. The steel looks somewhat similar to S35VN but with increased Nb and N, decreased C and V, and a 1.5% cobalt addition. Do a through test on 420 hc buck basic cryo hardened steel at there treatment level …corrosion,hardness .edge retention .most people need 420hc cryo because average people can’t sharpen good thanks, Your email address will not be published. I have an article about SPY27 which I wrote immediately after the announcement of the steel. By Larry Connelley When looking at quality American-made knives, you'll notice that S35VN and S30V steel are two of the more popular steels for knife blades. Enter your email address to subscribe to this blog and receive notifications of new posts by email. Despite its age, it’s a truly superior steel. OUT OF STOCK. It also appears that SPY27 did somewhat worse than S30V. In general, lower carbide volume means higher toughness. Based on the predicted alloy in solution for SPY27 it should have similar corrosion resistance to S30V and S35VN. Both S30V and S35VN steel are made with the same carbon and chrome content, and from various tests, both steels provide the same edge retention and corrosion resistance. Notify me of follow-up comments by email.  Originally developed by both Chris Reeve (a world renowned knife maker) and Dick Barber of Crucible Industries, S30V is a martensitic powder-made stainless steel. Para Military™ 2 Left Hand G-10 Black. So far only two stainless steels have failed this test, XHP and ZDP-189. The S30V and 420HC were also austenitized at 1950°F. The steel appears to be relatively well balanced and should do well for Spyderco. Yojimbo™ 2 Carbon Fiber CPM 20CV Exclusive. However, I think the toughness of S30V could be further improved with better heat treating, if we use what we learned with heat treating S35VN, S45VN, and SPY27. Therefore I would expect SPY27 to have toughness at least as good as S35VN and probably better, but that would have to be confirmed experimentally. $310.00. CPM SPY27 Steel. It sharpens easier and is cheaper while still having a pretty great edge retention. ... this one! Manix 2 Lightweight CPM SPY27. If you want to see tests as they are completed come join us on Patreon. There is also a small nitrogen addition which is made to increase hardness and corrosion resistance, as described in this article. CPM-S30V. As I said in the article, “I am probably unlikely to get flatstock for experiments due to the steel being exclusive to Spyderco.” However, after publishing I was contacted by Niagara Specialty Metals (company that hot rolls Crucible steels) and Spyderco offering me some steel for experiments. This provides the steel good flexibility, offering easy heat treatment to 60 Rc with commercial heat treating and also higher levels if desired. SPY27, S30V, and 420HC all passed without corrosion after 4 days. previously described corrosion resistance test, cobalt addition leading to slightly worse corrosion resistance. However, it is also controlled by carbide size and I do not have any micrographs of the new steel. See the edge retention prediction chart to see the expected carbide volume of SPY27 which came in under S35VN, S30V, S45VN, and Super Gold 2, and is also lower than Elmax and M390 which are not shown in the table. The ease or difficulty in burr removal would be more based on the heat treatment, particularly when it comes to retained austenite, as lower retained austenite makes burr removal easier. Thanks to A.N. Thanks to ShavedAlpaca, giorgi chubinidze, and Сергей Якунин for becoming Knife Steel Nerds Patreon supporters! So we can understand more the Steel, let’s see its chemical composition. 3/32" 1/8" 5/32" 3/16" Width. Become a patron and gain access to awesome rewards including early access to articles or a Knife Steel Nerds mug! The S35VN or CPM S35V is a high-end martensitic stainless steel made by @Crucible, high in Carbon, Vanadium, and chromium designed to offer a great balance between toughness, hardness and corrosion resistance.It’s used in long-wearing Specialty cutlery, Plastic Injection and Extrusion Feed Screws and Dies, Wear Components for Food and Chemical Processing, and of course in the Knife Industry. Experimental results of SPY27 line up well with the previously provided predictions. Speaking of S45VN, it is somewhat surprising that this steel has been announced so shortly after that steel being announced and released. For that article I predicted the relative performance of the steel based on its composition as no material was available for me to test. level 2. The Sebenza 21. $265.00. I will be posting results as they come in to Patreon and articles summarizing the tests will come later to this website. Austenitizing at a higher temperature means more chromium carbide is dissolved putting more chromium “in solution” to contribute to corrosion resistance. This is a lucky opportunity since it gives me the chance to see what the properties of the steel really are. The toughness is very close to S35VN. Has been sharpened once and will come razor sharp ... Spyderco Para Millie 2 Liner Lock Knife Black G-10 & CPM-S30V C81GP2. Exclusive Steel: Spyderco Native 5 With SPY27 Knife Review – Now Reviews Hub, Exclusive Steel: Spyderco Native 5 With SPY27 Knife Review | GearJunkie - GARDEN OUTDOOR PRESS, Exclusive Steel: Spyderco Native 5 With SPY27 Knife Review – Nowhere Bound Company. I then refinished them and started the 1% saltwater test which was 48 hours long. The carbide structure is explored in the next section. The compression lock is easy to unlock with a single hand and has a four way clip which will carry in any position that is desired. CPM, makes the steel stronger than the SAME steel made using a conventional steel manufacturing process. A 300°F temper is usually the minimum temperature I recommend while 400°F usually gives a good balance of hardness and toughness. Native® 5 FRN CPM® SPY27™ ... UK Penknife™ Red G-10 CPM S30V Exclusive. In the previous SPY27 article I said, “I would expect SPY27 to have toughness at least as good as S35VN and probably better, but that would have to be confirmed experimentally.” I tested toughness by austenitizing the steel at 2000 or 2050°F and then tempering at 400°F. Qty. I will be happy with edge performance anywhere in the S30V/Elmax range. You can read those experiments here. SPY27 and S30V have “good” or “above average” corrosion resistance but cannot match 420HC. 154CM 2.5 ft. lbs. The toughness is probably a bit better than S35VN. CPM is a trademarked name for a process that is also called Powdered Metallurgy or PM steel. You can read about edge retention and predicting it based on carbide content and hardness here. Nash, Matt Collingwood, Noah Cowan, James Pierce, and Jay Caponetti for becoming Knife Steel Nerds Patreon supporters! S35VN – 1975°F. However, as seen in the micrograph the “carbide clusters” in SPY27 are similar in size to the other steels. Yojimbo™ 2 G-10 Brown Black Blade CPM S90V Exclusive. The MC carbides are harder than most common abrasives apart from diamond and CBN, so lower MC content leads to easier sharpenability. The steel looks somewhat similar to S35VN but with increased Nb and N, decreased C and V, and a 1.5% cobalt addition. I could not tell the difference between the two heat treatments in this case, however. CPM-S30V has become one of the most used premium steels on the market among knife manufacturers. The edge retention of SPY27 is expected to be a bit below S35VN, similar to Super Gold 2, though higher than steels like VG10, 440C, and CPM-154. OUT OF STOCK. CPM S30V Stainless Steel Blanchard Ground. Thank you for the article Larrin. 1" 1 1/4" 1 1/2" 2" 4" Length. Para Military™ 2 G-10 Digital Camo/Black Blade. It sucks its exclusive to spyderco. The Nb content was bumped up to 1% from the 0.5% of S35VN and S45VN which will of course increase the amount of niobium carbide. This change led to a finer carbide structure and better toughness and machinability than S30V at the cost of a small reduction in edge retention. CPM SPY27 is a steel produced by Crucible exclusively for Spyderco. The Cr and Mo addition provides corrosion resistance, hardenability, and secondary hardening. The CPM154 was marked at the point somewhere around 20 ft-lbs in your previous chart but now at 5-10 ft-lbs only? Notify me of follow-up comments by email. Despite the reduced carbide content of SPY27 the toughness was similar to S35VN. The carbon content is of SPY27 is balanced to result in a similar hardness to S35VN, S30V, and S45VN, as indicated by carbon in solution estimates from Thermo-Calc: Therefore we would expect the steel to reach a similar hardness to those other CPM stainless steels. On January 15, 2020 Spyderco announced [1] knives being produced in a new steel: CPM SPY27, a steel produced by Crucible. $329.95. lbs., the transverse toughness of CPM S30V is four times greater than that of 440C or 154CM. I have previously performed corrosion resistance experiments and related it to predicted chromium and other alloying elements “in solution,” as you can read here. The cobalt addition increases secondary hardening when tempering in the upper temperature range, which I have written about previously here and here. Niobium carbides have also been found to help refine the microstructure of steel. S30V – 2000°F. Enter your email address to subscribe to this blog and receive notifications of new posts by email. Being a little bigger than the Para 3 and utilizing the strong ball bearing locking mechanism and light weight FRCP handles this is sure to be a great knife. $236.00. There is a powder form, CPM-D2, ... Crucible intends SPY27 to be good all-around knife steel. It may be that without reducing the chromium carbide content to much lower levels that the toughness remains limited to about 10-12 ft-lbs as is seen with many of these stainless PM steels like Elmax, M390, CPM-154, S35VN, S30V, SG2, etc. I performed two heat treatments with SPY27, one austenitizing at 1950°F and another at 2050°F. CPM SPY27 is a steel produced by Crucible exclusively for Spyderco. $104.95. I used carbide contents from Thermo-Calc to estimate CATRA edge retention relative to 440C at 58 Rc (100%). However, there is another proposed explanation which I will cover along with the micrographs below. In the previous SPY27 article I predicted that it would have “similar hardness to S35VN, S30V, and S45VN” when heat treating with similar parameters. And it gives everyone else a chance to see whether I am any good at predicting properties of steel based on composition. I then tempered specimens twice for two hours each time at 300, 400, and 600°F and plotted out the resulting hardness. SPY27 – 2050°F. ; 15.25% of Chromium: For tensile strength and Edge retention, and enhances corrosion resistance and wear resistance. I expected the toughness to be better because of the reduced carbon and carbide content when compared with S35VN. I austenitized the steel at different temperatures for 20 minutes and quenched between two 1″ aluminum plates which provides faster cooling rates than holding in air and also helps keeps specimens flat. Become a patron and gain access to awesome rewards including early access to articles or a Knife Steel Nerds mug! Contrary to some information available out there, cobalt does not improve toughness or corrosion resistance. from $34.87. S35VN had a somewhat reduced vanadium content (3%) in combination with 0.5% niobium. That’s very interesting. The resulting steel is expected to have similar hardness and corrosion resistance to S30V and S35VN. 18 . Native® 5 FRN CPM® SPY27™ ... Para Military™ 2 G-10 Dark Blue CPM S110V. 5 months ago. You can read about cold treatments in these articles: Part 1, Part 2, Part 3. Crucible seems to be coming out with more steels lately. The Para 3 Lightweight and Manix 2 Lightweight will be the first two models to feature CPM SPY27 blade steel. S30V . These higher transverse toughness results indicate that CPM S30V is much All of these specimens included a cryo treatment after quenching before tempering. Update 3/10/2020: We did a range of experiments with SPY27 to supplement the estimates in this article. The microstructure confirms somewhat reduced carbide content relative to S35VN, S30V, and S45VN. The steel can be heat treated over 64 Rc with a liquid nitrogen treatment and a 300°F temper and a range of lower hardness levels with different combinations of parameters. MSRP: $175.00. The resulting steel is expected to have similar hardness and corrosion resistance to S30V and S35VN. The two SPY27 specimens look relatively similar to S30V, and all three are significantly worse than the 420HC. Quick View Thickness. You can see my corrosion resistance rating in the table below: This is a pretty decent corrosion resistance, similar to Elmax (7.8), but is below steels like S45VN (8.4), M390 (9.1), and Vanax (10). Had a couple scratches on blade and a couple on handle. In the article on S45VN, I found that austenitizing at 2000°F led to a finer microstructure than 1950°F. The second model to come out with the new SPY27 steel is the Manix 2. Discuss Spyderco's products and history. I have a new CATRA edge retention testing machine. ... CPM 20V, and CTS 204P), we would have the differences from different processes at the different mills and possibly different heat treats. CPM S30V Stainless Steel Precision Ground. The S30V sample I tested was austenitized at 2000°F and tempered at 500°F. $151.25. The more steels and heat treatments we have added to the toughness chart the more that value of CPM-154 has looked out of place. Shipped with USPS First Class. Here’s what Buck Knives says about S30V: “We consider this the absolute best blade steel available, and it is made in America.” Here are some experimental results of different steels for CATRA slicing edge retention to get a feel for where SPY27 may sit: Toughness of steel can be difficult to predict based only on composition or carbide content. Posted by. The austenitizing temperatures were 1950, 2000, 2050, and 2100°F. Great breakdown Larrin. [1] https://catalog.spyderco.com/Reveal4/?page=10, [2] https://forum.spyderco.com/viewtopic.php?f=2&t=85769, [3] https://www.spyderco.com/edge-u-cation/steel-chart/. Unfortunately, I am probably unlikely to get flatstock for experiments due to the steel being exclusive to Spyderco. $269.95. This new design features a slimmer profile so that it feels better in the closed position. 18. To see how common the clusters of carbides are I have a lower magnification image of SPY27 below: I also gave some estimates of edge retention, finishing, and sharpening of SPY27. The edge retention is likely a small step down from S35VN. The steel is capable of relatively high hardness, reaching over 65 Rc “as-quenched” before tempering, and nearly 64 Rc even without a cold treatment. So I was right that the toughness is “at least as good as S35VN” but the “probably better” was a bit too strong.